Circoviridae
| Circoviridae | |
|---|---|
| Virus classification | |
| Group: | Group II (ssDNA) |
| Family: | Circoviridae |
| Genera | |
The Circoviridae are a family of viruses. These are small, relatively poorly-studied viruses, with circular, single-stranded DNA genomes of approximately one to four kilobases.
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Virology [edit]
Circoviridae virons are non enveloped and about 20 nanometers in diameter with icosahedral symmetry (triangulation number (T) = 1). The capsid consists of 12 pentagonal trumpet shaped pentamers.
The genome is monopartite, circular, single-stranded DNA of between 1.8 to 3.8 kilobases. There are two main open reading frames arranged in opposite directions that encode the replication (Rep) and capsid (Cap) proteins. Alternative start codons are common in the avian species.
The viruses replicate their genomes via a rolling circle mechanism. A stem loop structure with a conserved nonanucleotide motif is located at the 5' intergenic region of circovirus genomes and is thought to initiate rolling-cycle replication.
Taxonomy [edit]
The family Circoviridae contains three genera, Circovirus, Cyclovirus and Gyrovirus.
Two circoviruses have been identified in fish - Barbel circovirus (BaCV) 1 and 2.[1] Their genomes are in length and contain two major open reading frames similar to the capsid and replication associated protein genes found in other circoviruses.
- Genus Circovirus: type species: Porcine circovirus type 1 and 2, beak and feather disease virus (BFDV)[2]
- Genus Cyclovirus : Dragonfly cyclovirus, Florida woods cockroach-associated cyclovirus[3]
- Genus Gyrovirus: type species: Chicken anaemia virus
See also [edit]
References [edit]
- ^ Lorincz M, Csagola A, Farkas SL, Szekely C, Tuboly T (2011) First detection and analysis of a fish circovirus. J Gen Virol
- ^ Mankertz P (2008). "Molecular Biology of Porcine Circoviruses". Animal Viruses: Molecular Biology. Caister Academic Press. ISBN 978-1-904455-22-6.
- ^ Dayaram A, Potter KA, Moline AB, Rosenstein DD, Marinov M, Thomas JE, Beitbart M, Rosario K, Argüello-Astorga GR, Varsani A (2013) High global diversity of cycloviruses amongst dragonflies. J Gen Virol
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External links [edit]
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